36 / 60 = 0.6 = 60 %
First we convert 40% to a decimal. we get 40/100 or 0.40 then we multiply it by 60 0.4*60 = 24 so 40% of 60 minuts is 24 minuts
12/480 = 1/40 = 0.025 = 2.5%
It is 1.66...%. 1 divided by 60 equals that.
50.4 seconds.